well I have tried that but the modules that contain the package is in other directory:

the tests then restore to what it was.
Here is my dir structure (all windows):
tools\DBQuery\Data\BackendMap.pm
tools\ToolLog\Logging.pm
test folders:
tools\DBQuery\test\TstBackEndMap\testbackendmap.t
so testbackendmap.t need to use Data::BackendMap but it cannot find it event I tried to use use lib
qw(Data::BackendMap); or somehow I need to supply a reltive path and not the full path because I do not want to
restrict where the app to be placed in the system thanks